Former CIA head James Woolsey still has a great range for a spook — and may now be heading to Broadway. Woolsey joined musical-comedy duo Michael Garin and Mardie Millit on the piano at Elaine’s on Sunday night and performed “That’s Diplomacy” from the upcoming musical “John Goldfarb, Please Come Home.” Garin told the crowd that Woolsey is involved with the show, in which he’d play a character who is — guess! — the head of the CIA. “Goldfarb” is based on the book and 1965 film by William Peter Blatty, who’s supervising the production with Garin as co-writer.